Wrangell Sentinel -

Photos from: Water alert level lowers to Stage II watch

Dan Rudy/ Wrangell Sentinel

A new kind of filter is in the process of being tested out at Wrangell's water treatment plant. Samples are currently being taken of the device's output, which runs through a cylindrical screen mesh rated to five microns. What sets it apart from the plant's current roughing filters is its ability to self-flush, clearing the screen of blockage. A gauge is set to automatically trigger the flushing system when inflow and outflow pressure reaches a differential of 7.5 PSI.